Boston AM News Links: New poll in mayor's race has Walsh and Connolly on top, Sean Collier posthumously sworn in as Somerville cop

A new poll of the Boston mayoral race from Sage Systems found over a third of voters remain undecided while Councilor John Connolly and state Representative Martin Walsh lead the field as the only candidates in double digits. Suffolk County District Attorney Daniel Conley came in third.

The police officer allegedly ambushed by the Boston Marathon bombers was posthumously sworn into the Somerville Police Department yesterday. Sean Collier was slated to join the force this past June. Shira Schoenberg was there.